The best rope for windlass and anchor chains is typically a high-quality nylon or polyester rope, known for its strength, durability, and shock absorption. It should be spliced or fitted with a thimble to prevent wear and ensure smooth operation through the windlass. Choose a size and construction that matches your anchor chain and windlass specifications for optimal performance.

Size: 12mm to 24mm diameter, depending on vessel size and load requirements.

Grade: High-tenacity polyester or nylon, typically meeting ISO 10572 or equivalent standards.

Viscosity: N/A (ropes are solid, not fluid).

Buoyancy: Polyester is neutrally buoyant, while nylon absorbs water and may sink.

Material: Polyester (Dacron) or nylon for elasticity and strength; some use Dyneema for high-load applications.

Breaking Strength: 8,000 lbs to 40,000 lbs, depending on diameter and material.

Elongation: Nylon stretches 15-30%, polyester 10-15%, Dyneema less than 5%.

UV Resistance: High for polyester and Dyneema; moderate for nylon.

Abrasion Resistance: Reinforced outer sheath or double-braided construction.

Knotability: Moderate to high, depending on stiffness (polyester is stiffer than nylon).

Chemical Resistance: Resistant to saltwater, oils, and most marine chemicals.

Temperature Range: -40°C to 80°C for polyester and nylon; higher for Dyneema.

Spliceability: Requires specialized techniques for high-modulus fibers like Dyneema.